Re: performance / IOP

Claudio Kuenzler <ck@xxxxxxxxxxxxxxxxxxx> · Fri, 20 Jun 2014 19:51:08 +0200

No official document here, but just a quick and dirty dd on my first glusterfs install (back in February).
Setup: Two servers, replica=2, Hardware Raid 1, SATA Nearline 10k

On a clean system (back in February) without anything else running:

time { dd if=/dev/zero of=/mnt/vmdata/file.tmp bs=32768 count=32768; sync; }
32768+0 records in
32768+0 records out
1073741824 bytes (1.1 GB) copied, 17.3732 s, 61.8 MB/s

real    0m17.594s
user    0m0.028s
sys     0m4.697s

Today I just ran another dd, just for 
you.. The glusterfs mounted volume is only used for nightly backups so 
no current traffic on it (but the disks themselves are having some 
I/O's). Note this is no high end system, just a small Proxmox cluster 
for some vms.

time { dd if=/dev/zero of=/mnt/pve/vol1/dump/file.tmp bs=4096 count=1000000; sync; }
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 162.628 s, 25.2 MB/s

real    2m42.844s

user    0m1.072s
sys     0m30.541s

..........

 time { dd if=/dev/zero of=/mnt/pve/vol1/dump/file.tmp bs=4096 count=10000000; sync; }
10000000+0 records in
10000000+0 records out
40960000000 bytes (41 GB) copied, 1674.28 s, 24.5 MB/s

real    27m54.772s
user    0m9.151s
sys     4m26.453s

Hope these values help to give you a "starting point". 

On Fri, Jun 20, 2014 at 1:03 PM, Uwe Kastens <kisteorg@xxxxxxxxxxxxxx> wrote:

Hi there, 

Are there any documents available which allows to get an idea about performance and IOPs? 

If I understand the concept correctly a brick could be a harddisk or a subset of a RAID. So if would simply mirror two bricks on two servers the limiting factor would be the NIC between? 

Maybe someone could give a starting point. 

Kind Regards

Kiste

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